All steps and detailed tutorial can be found on my Medium. Here is the link: https://medium.com/@bogachanyigitbasi/verify-signature-on-ethereum-using-foundry-454341cf80a2

ECDSA Practice

• To create&activate the venv python3 -m venv path/to/venv source path/to/venv/bin/activate

• Install required python libraries python3 -m pip install ecdsa eth-keys

• We can use this tool to generate a pair of public private ECDSA keys https://emn178.github.io/online-tools/ecdsa/key-generator/

Signing

Sign a message to generate the values of r, s which is the signature.

Verification

For verification, one needs to receive the signature (r,s), signed message and public key. It is possible to do it without receiving the public key if you know how to recover it. Using the algorithm shared in the next step.

Re-compute Public Key

How a public key can be recovered, in Ethereum context how ecrecover function works under the hood.

Solidity

Foundry

Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.

Foundry consists of:

• Forge: Ethereum testing framework (like Truffle, Hardhat and DappTools).
• Cast: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
• Anvil: Local Ethereum node, akin to Ganache, Hardhat Network.
• Chisel: Fast, utilitarian, and verbose solidity REPL.

Documentation

https://book.getfoundry.sh/

Usage

Build

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help